string ="他问，你知道cba十什么单词的缩写么  ？  "
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.推出')
while True:
    option  = input("请输入功能选项：\n")
    if option =='1':
        string = string.replace(' ',' ')
        print(string)
    elif option =='2':
       for i in string :
           if i =='，':
               string = string.replace(',','，')
           elif i =='.':
               string = string.replace('.','.')
           elif i == '？':
               string = string.replace('?', '？')
           elif i == '‘':
               string = string.replace(" ' ", " ’ ")
       string = string
       print(string)
    elif option =='3':
        string = string.upper()
        print(string)
    elif option =='4':
        break

